Wrapper and method and apparatus for forming it



0a. 6, 1936. F. R. CLARK 2,056,825

WRAPPER AND METHOD AND APPARATUS FOR FORMING IT Filed May 11, 1934 3Sheets-Sheet 1 2 A f9 79 7a x f2 1: 3 /30 j INVENTOR fiA/VC/J Ems ('umxATTORNEYS 3 Sheets-Sheet 2 I l I I F. R. CLARK Filed May 11, 1954WRAPPER AND METHOD AND APPARATUS FOR FORMING IT Oct. 6, 1936. F. R.CLARK I 2,056,825

WRAPPER AND METHOD AND APPARATUS FOR FORMING IT Filed May 11, 1934 w 221;: \V fig 1- w i NVENTOR Eula/s [Poss 0M1 ATTORNEYS 3 Sheets-Sheet 3.

Patented Oct. 6, 1936 WRAPPER AND METHOD AND ArPAnA'rus FOR. FORMING rrFrancis Ross Clark, Springfield; Mass., asslgnor to Package MachineryCompany, Springfield, Mass., a corporation of MassachusettsApplication'May 11, 1934, Serial No. 725,168

Claims.

In the wrapping of articles by machine, various forms of treatment ofthe wrapper to produce a tearing strip have been proposed. In general itmay be said that the tearing strips formed by 5 a pleating of thewrapping material lacked the necessarystrength, and those formed by thegluing of a separate tearing strip to the wrapper sometimes gave troubledue to the seepage of the sealing material into contact with the printedor decorated article underneath. It is one object of the presentinvention to provide a new wrapper, in-which a tearing strip isincorporated, and also a new method and a'machine for making such awrapper, in which these difliculties are avoided. Another object of theinvention is to provide a wrapper which will be extremelydifiicult tocounterfeit and thus to add to the protection against the substitutionof goods of one manufacturer for those of another. Additional ob- LJ'ects will appear from the description and claims.

ping machine, illustrating the present invention applied thereto Fig. 2is a detail of a portion of the mechanism shown in Fig. 1, looking inthe direction of line 2-2 of Fig. 1;

Fig. 3 is a detail of the pleating or folding box in which the tearingstrip is formed;

Fig. 4 is a'similar view with the cover removed;

Fig. 5 is a detail view of the inside of the cover;

Fig. 6 is a section on line 6-6 of Fig. 3; Fig. 7 is a sectionpn line 11of Fig. 3; Fig. 8 is a section on line 8--8 of Fig. 4; Fig. 9 is asection on an enlarged scale, taken on line 9-9 of Fig. 3;

Fig. 10 is a section onan enlarged scale, taken on line Ill-l0 ofFig. 3;I

Fig. 11 is an enlarged detail showing the inter- 40 action between theparts of the pleat forming mechanism;

Figs. 12 to 14 are enlarged details corresponding to portions of Figs.6, 7, and 9 respectively, but showing the wrapper and tearing strip tape&5 in place;

Fig. 15 is a similar detail on line l5-l5 of i Fig. 16 is a viewcorresponding generally to Fig. 3 but showing the parts in unlatchedpositions; :5 and Fig. 1'7 is a view of a package embodying the improvedtearing strip.

The wrapping machine to which the invention is applied may be of anydesired type.- It is here 55 shown conventionally as having a support 20from which an article a is carried by a pusher 2| into a wrapping pocket22. Between the support and the pocket a wrapper s is delivered from aguide chute 23 and is cut off by suitableshears 24. This wrapper isdelivered from a reel 25. supported on a shaft 26 carried in open slots21 by the wrapper feed bracket 28. From this reel the wrapper passesover a guide roll 29, through a pleating or folding box indicatedgenerically in Fig. 1 by 30, between a rubber covered roll 38 and asteel roll 32; and'around guide rolls 33, 34, and 35 to the chute 23.The rolls 38 and 32 are driven, generally intermittently, by any of theusual mechanisms. The folding box is held on a cross bar 3| by a clampscrew 36 (Fig. 8) and is adjustable in angular position by a pair ofscrews 31 passing through cross rods 38.

A tape it is carried on a reel 4| rotatable on a rod 42 carried in thebracket 28 and frictionally controlled by being mounted between collars43 and 44, the former of which is fixed and the latter pressed againstthe reel by a spring 45. As shown in Fig. 2, the tape is narrow andinorder to hold 4 a comparatively large amount the reel is maderelatively wide, the tape being wound on it in the manner of string on aspool. It is therefore necessary to provide means for guiding the .tapeinto proper lateral registration with the folding box. In the presentcase a pair of rolls 46 and 41 are mounted on an arm 48 carried by thecross bar 3i, the former of these rolls having a tape guiding groove 49.The tape passes from rolls 46, 41 over the roll 29, which also has aguidinggroove 50, rubbing in its way over a wick'5i extending from asolvent reservoir 52. Solvent is used in cases where the wrapper andtape are composed of some material such as cellulose acetate, or one ofthe various cellulose derivatives having a soluble coating. In othercases an adhesive would be applied in any suitable wayas by a roll.

The construction of the folding box 39 will now be considered,in detail.The base or tray 55 forming one-half of the device is mounted on therods 3|, 39 as previously described. A wrapper receiving recess 56 isformed in the tray, of the width of the wrapper web being fed throughthe folding box. In a groove formed in the bottom of this recess a bar51 is held by screws 58 and has a rib 59 on its top tapered to a pointin the direction of travel of the web. Upon the top of this rib a thinplate 60 is brazed or otherwise secured, the plate overlying the pointedend of. the rib to form a template around which the box pleat may beformed.

- Secured to the tray 55 by hinges BI is a cover 62 carrying thecooperating parts of the box pleating apparatus. These comprise foldingwings 63 bent as shown in Fig. 9 to underlie the plate 60, and fastenedas by screws 64 and cap plates 65 to slide members 66. The members 66and their cap plates are formed (Fig. 10) to embrace the walls of slots51 formed in the cover, and are normally held so as to press the wings63 yieldingly against the rib 59 as shown in Fig. 15 'by a contractilespring 68. As the web is drawn through the folding box it is firstarched upwardly as in Fig. 12 by the rib 59 and plate-60, and the sidesof the pleat are tucked under this arched portion by the folders 63which reach a practically abutting position underneath the overhangingportion of the plate. The successive positions of the pleat shown inFigs. 12 to 15 are diagrammatic only, and are not intended as definitivedetails of the action of the folders. In considering these views itshould be remembered that the folds of the pleat have a tendency toremain straight between their initial and final positions, and thefolders have been designed with this tendency in view.

It will be recalled that the tape't has been coated with a sealingliquid so that it adheres to the wrapper intermediate the side pleats.In

the preferred case the sealing liquid is applied to the side of the tapeaway from the plate ill only, so that when thepleat is completed thefolded portions of the pleats will not be adhesively secured in place.This method of formation has several advantages over a mere tearingstrip adhesively secured to the wrapper or to a pleat adhesively securedtogether with or without a tearing strip. It will be recalled that thecomposite wrapper, when of transparent material, is intended for useupon an article which is generally contained within an inner printed ordecorated wrapper. Such a wrapper is easily marred by the adhesives orsolvents used to secure the tape and transparent wrapper together. Thelocalization of the sealing liquid on the outer surface of the tape. andthe infolding of the wrapper under the tape, effectively prevent anyescape of the liquid to a position where it can come in contact with theunderlying printed wrapper. The adhesion of the tape to the wrapper sprevents any slippagewhen the end 0 (Fig. 17) of the tearing strip ispulled, while the tape makes a much strongertearing strip than if itwere attempted only to secure the folds of the pleat together.

' It is necessary to provide for the withdrawal of the folders 63 fromunderneath the 'plate and to make the inside of the folding boxaccessible when it is desired'to-thread in a new web. As previouslymentioned, the cover 62 which carries the folders 63 is supported fromthe base of the folding box by hinges 8i. When in assembled position thecover is locked by a slide 10 running in guides H and having a pro-Jecting portion 12. This projection is so located that when the cover isdown it may be moved underneath an overhanging member 13 secured to thebody by screws 14 and fitting in a hole 15 formed in the cover. Toincrease the stability of the assembly this member is provided with aball 16 fitting in a hole having a constricted lower end and presseddownwardly by a spring 11 compressed between it and a cap plate 18. Theslide has a handle portion 19 by which'it may be moved from the lockingposition of Fig. 3 to the unlocking position of Fig. 16, in the latter.of which the projection 12 is moved clear of the member II. In thelatter position also a tapered end on the slide comes between taperedsurfaces 8| on the folder carrying members 66 previously described, sothat when theslide is moved to unlock the cover it will also move thefolders out from underneath the plate 80.

I claim:

1. A device for forming tearing strips on wrappers which comprises meansfor adherently securing a tape and a wrapper strip, means for infoldingportions of the wrapper strip underneath the strip to form a-box pleatenclosing it, and means for pressing the assembly in flattened form.

2. A device for forming tearing strips on wrappers which comprises abody portion, a.

tapering rib on the body portion, a plate secured to the rib andoverhang ng the tapered end thereof, a cover removabiy secured to thebody 7 portion, folding .membersmo'unted on the cover to underlie theplate when the cover and body portion are assembled, a latch carried bythe cover and engageable with the body portion to hold the cover inposition, and connections between the latch and the folding members tomove the latter out of their underlying relation with the plate when thelatch is shifted to disconnect the cover from the body portion.

4. A method of making a wrapper provided with a tearing strip whichcomprises coating one side of the tearing strip with a sealing liquid.applying the coated side of the strip'to the wrapper, folding thewrapper in reverse folds at the side of the strip, and pressing thereversely folded portion of the wrapper over the strip to form a shieldnon-adherently covering the strip.

5. A device for making a wrapper provided with a tearing strip, whichcomprises means for coating one side of a tearing strip with a sealingliquid, means for pressing the coated side of the I

